Vulnerability · Published Jul 30, 2026 · Assigned by icscert
CVE-2026-63550MZ Automation libiec61850 Out-of-bounds Read
Medium 6.5
In plain English
A medium-severity out-of-bounds read in libiec61850 from MZ Automation GmbH. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Official description
The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over an established MMS session (TCP port 102), the decoder may advance its internal read position incorrectly, leading to a heap out-of-bounds read. This condition causes the MMS handling process to terminate unexpectedly, resulting in a denial-of-service.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MZ Automation GmbH | libiec61850 | 0 – before 1.6.2 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H